envoy-filter.yaml

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: header-filter
  namespace: gcp
spec:
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: SIDECAR_INBOUND
        proxy:
          proxyVersion: '^1\.8.*'
        listener:
          portNumber: 8080
          filterChain:
            filter:
              name: envoy.filters.network.http_connection_manager
              subFilter:
                name: envoy.filters.http.router
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.filters.http.wasm
          typed_config:
            "@type": type.googleapis.com/udpa.type.v1.TypedStruct
            type_url: type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
            value:
              config:
                configuration:
                  "@type": type.googleapis.com/google.protobuf.StringValue
                  value: |
                    {
                      "header": "x-wasm-header",
                      "value": "demo-wasm"
                    }
                vm_config:
                  code:
                    local:
                      filename: /var/local/lib/wasm-filters/header-filter.wasm
                  runtime: envoy.wasm.runtime.v8
                  allow_precompiled: false
  workloadSelector:
    labels:
      app: o2oms-gateway
      version: beta